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| Lake Crescent | |
|---|---|
 View of the ancient landslide that dammed Lake Crescent | |
  Lake Crescent  Lake Crescent | |
| Location | Clallam County, Washington |
| Coordinates | 48°04′N 123°50′W / 48.06°N 123.83°W |
| Type | Crescent |
| Primary inflows | Barnes Creek, Smith Creek, Aurora Creek, Eagle Creek |
| Primary outflows | Lyre River |
| Basin countries | United States |
| Max. length | 12 mi (19 km) |
| Surface area | 5,127-acre (21 km2) |
| Average depth | 300 ft (91 m) |
| Max. depth | 624 ft (190 m) |
| Surface elevation | 580 ft (180 m) |
| Settlements | Piedmont |
Lake Crescent is a deep lake located entirely within Olympic National Park in Clallam County, Washington, United States, approximately 17 miles (27 km) west of Port Angeles on U.S. Route 101, near the small community of Piedmont. With an official maximum depth of 624 feet (190 m), it is officially the second deepest lake in the state of Washington (after Lake Chelan). A lake-wide bathymetric survey was performed from 2013 to 2014 by Eian Ray and Jeff Engea and the results of this survey show the maximum depth as being 596 feet (182 m). Using GIS statistical analysis, this survey also estimated that the lake contains around 0.5 cubic miles (2.1 km3) of fresh water.
Lake Crescent is known for brilliant blue waters and exceptional clarity caused by low levels of nitrogen in the water[1] that inhibit the growth of algae. The lake is located in a popular recreational area and features several trails, including the Spruce Railroad Trail, Pyramid Mountain trail, and the Barnes Creek trail to Marymere Falls. The Spruce Railroad Trail follows the grade of what was once the tracks of a logging railroad along the shores of the lake. By following this trail on the north side of the lake one can find the entrance to an old railroad tunnel that is now part of the Spruce Railroad Trail, providing access to "Devils Punch Bowl", a popular swimming and diving area.
- ^ Cox, S.E.; Moran, P.W.; Huffman, R.L.; Fradkin, S.C. (2016). Monitoring Plant Tissue Nitrogen Isotopes to Assess Nearshore Inputs of Nitrogen to Lake Crescent, Olympic National Park, Washington (PDF) (Report). U.S. Geological Survey.